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Metastable motion anisotropy

Published online by Cambridge University Press:  02 June 2009

Avi Chaudhuri  and
Donald A. Glaser
Avi Chaudhuri
Affiliation:
School of Optometry and Departments of Physics and Molecular and Cell Biology, University of California, Berkeley
Donald A. Glaser
Affiliation:
School of Optometry and Departments of Physics and Molecular and Cell Biology, University of California, Berkeley
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Abstract

The phenomenon of apparent motion can arise when two spatially separated visual tokens are presented in temporal sequence. If tokens at opposite corners of a hypothetical square are presented simultaneously followed by simultaneous presentation of tokens at the remaining two corners, an apparent motion percept may occur along either the vertical or horizontal axis. The display is perceptually metastable since most observers will perceive motion along only one axis at a time. The metastable display, however, produces anisotropic results, in that with central fixation, vertical motion is seen more frequently than horizontal motion. The ratio of the vertical to horizontal length of the sides of a rectangle needed to achieve equal frequencies of motion judgments along the respective axes falls in the range of 1.18–1.92 for different observers in our experiments. It appears that signal transmission across the vertical midline is a major determinant of the vertical bias, since the anisotropic effects disappear when the fixation point is sufficiently offset along the horizontal meridian so as to cause a fully homonymous representation of all of the metastable tokens. One of the factors may be signal degradation or delay in callosal transmission which could reduce the strength of the motion signal along the horizontal axis. In addition, there appears to be a strip along the vertical midline with a width of 30–50 min are within which reduced levels of anisotropy are found. The possibility that this strip is a consequence of a zone of naso-temporal overlap in the projection of the retina to the brain along the vertical meridian will be discussed.

Keywords

Bistable quartetNaso-temporal overlapDecussationInterhemispheric transmissionApparent motion
Type
Research Articles
Information
Visual Neuroscience , Volume 7 , Issue 5 , November 1991 , pp. 397 - 407
Copyright
Copyright © Cambridge University Press 1991

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